I want to buy a rope which is _____________this oneA.twice as longer asB.as twice long asC.twice the length ofD.as twice as
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C解析考查倍数。倍数的表达有：倍数 + as + 形容词或副词的原级 + as + 其他；倍数 + 形容词（或副词）的比较级 + than + 其他；倍数 + the size / height / length / width. etc. + of + 其他。故选C。